refactor(pglite): promote to prisma submodule

Make pglite part of the core codebase, so that we can use it in
environments where postgres may not be available, such as in
browser-only environments like StackBlitz.

- Rename prisma -> prisma/index to host submodules
- Move pglite-related logic to pglite
  - Wrap actual init of PGlite as factory, and not
    within module load
- Rework vitest.setup to depend on new submodule
  - Keep resetDb, since that is only useful to testing

src/server/prisma/pglite.ts

@@ -0,0 +1,25 @@
+import { PGlite } from '@electric-sql/pglite'
+import { PrismaPGlite } from 'pglite-prisma-adapter'
+import { PrismaClient } from '@prisma/client'
+import { readdirSync, readFileSync, statSync } from 'node:fs'
+
+export const makePgliteClient = () => {
+  const client = new PGlite()
+  const adapter = new PrismaPGlite(client)
+  return {
+    client,
+    prisma: new PrismaClient({ adapter }),
+  }
+}
+
+export const applyMigrations = async (client: PGlite) => {
+  const prismaMigrationDir = './prisma/migrations'
+  const directory = readdirSync(prismaMigrationDir).sort()
+  for (const file of directory) {
+    const name = `${prismaMigrationDir}/${file}`
+    if (statSync(name).isDirectory()) {
+      const migration = readFileSync(`${name}/migration.sql`, 'utf8')
+      await client.exec(migration)
+    }
+  }
+}

vitest.setup.ts

@@ -1,18 +1,13 @@
 import { vi } from 'vitest'
-import { PGlite } from '@electric-sql/pglite'
-import { PrismaPGlite } from 'pglite-prisma-adapter'
-import { PrismaClient } from '@prisma/client'
-import { readdirSync, readFileSync, statSync } from 'node:fs'
+import { makePgliteClient, applyMigrations } from '~/server/prisma/pglite'
 
-const client = new PGlite()
-const adapter = new PrismaPGlite(client)
-const prisma = new PrismaClient({ adapter })
+const { client, prisma } = makePgliteClient()
 
 vi.mock('./src/server/prisma', () => ({
   prisma,
 }))
 
-export const resetDb = async () => {
+const resetDb = async () => {
   try {
     await client.exec(`DROP SCHEMA public CASCADE`)
     await client.exec(`CREATE SCHEMA public`)
@@ -21,21 +16,9 @@ export const resetDb = async () => {
   }
 }
 
-const applyMigrations = async () => {
-  const prismaMigrationDir = './prisma/migrations'
-  const directory = readdirSync(prismaMigrationDir).sort()
-  for (const file of directory) {
-    const name = `${prismaMigrationDir}/${file}`
-    if (statSync(name).isDirectory()) {
-      const migration = readFileSync(`${name}/migration.sql`, 'utf8')
-      await client.exec(migration)
-    }
-  }
-}
-
 // Apply migrations before each test
 beforeEach(async () => {
-  await applyMigrations()
+  await applyMigrations(client)
 })
 
 // Clean up the database after each test